Common.cpp: Minor code refactoring
TFTPFileSystem::HandleAsynchRequestNeedPass: Set Data.Password = NULL

This fixes Issue #56
Merge branch 'issue56'

* issue56:
  TFTPFileSystem::HandleAsynchRequestNeedPass: Set Data.Password = NULL
  Common.cpp: Minor code refactoring
version info: update
Merge branch 'master' into far3

* master:
  version info: update
  TFTPFileSystem::HandleAsynchRequestNeedPass: Set Data.Password = NULL
  Common.cpp: Minor code refactoring